Tag: "temperature" at biology news
Study finds evidence for global methane release about 600 million years ago
...ean carbonate sediments that were deposited as the temperature
rose. The methane gas was apparently derived from the melting of frozen methane clathrate crystals that had accumulated beneath the seafloor. "The extremely negative isotopic values from these sediments provide unambiguous evidence for methane-derive...
Kyoto and beyond
...rise by about 8 meters and the average air surface temperature
by about 9 degrees Celsius in the later part of this millennium. Because of the long residence time of CO2 of more than 100 years in the atmosphere, climate response is governed by cumulative rather than current CO2 emissions. Important is not the d...
Beetles could prove a hit with the aircraft industry
...aft engine which has cut out, when the outside air temperature
is as low as minus50 degrees Centigrade! Due to start early next year, this innovative 3-year project at the University of Leeds is being funded by the Engineering and Physical Sciences Research Council (EPSRC). The bombardier beetle defends itself...
Changing one gene launches new fly species
...ere there is less competition for food but greater temperature
variation, have a smaller, inactive version of ds2. The same gene plays a role in the production of cuticular hydrocarbons -- waxy, aromatic compounds that coat the abdomen of female flies. A male fly, in a romantic mood, strokes the female's abdo...
Easily paralyzed flies provide clues to neurodegeneration
... a raft of fly mutants that, when exposed to minor temperature
change, become completely paralyzed. The flies, wh...s Ganetzky. The flies' sensitivity to temperature
provides a unique ability to control the onset of their physiological defects, and is useful in help...
Nutrient-poor oceans generate their food 'hot spots'
...ts of great expanses of warm water with an average temperature
of 28 C (a greater surface area than Europe), which receives no input of deep-source cold water, rich in nutrient salts. However, in 2000 analyses of satellite observations on the colour of the ocean conducted by American scientists revealed unusual...
Mercury in ocean fish may come from natural sources, not pollution
...hermocline" a transition layer in the ocean where temperature
changes rapidly. The findings imply that the high levels of methylmercury in these fish are not coming from increased pollution, but from a natural source. The specific source is not yet clear, Morel says, but he suggests it could be hydrothermal ...
Researchers call for trials of menstrual cycle monitors used for natural family planning
...indicators of fertility changes in her basal body temperature
and in her cervical mucus patterns, plus some calc... Three methods also applying the rules of the body temperature
method but involving a mini-computer to record and store the data also performed reasonably well wit...
Climate linked to reproduction of right whales
...tures and winds; patterns in ocean currents, water temperature
and salinity; the food resources required by whale...ecies, Calanus finmarchicus , tracks these ocean temperature
fluctuations. From these relationships, Pershing and Greene were able to develop a computer model to...
Over land, sea and air, users give MERIS high marks
...ously measure important variables like sea surface temperature
and ocean currents. Knowing these will be necessary to make forecasting the drift of algae blooms a reality." Looking forward In concluding the Workshop on Thursday afternoon, Peter Regner thanked all participants for the very high quality contri...
Researchers find new form of hormone that helps songbirds reproduce
... organisms respond to changes in various triggers temperature
change, for example in their environments. The sc...gly fleeting and subtle environmental cues such as temperature
fluctuation, rivalry and vocalization. The response to these cues can have a profound impact on repr...
Ultra-low oxygen could have triggered die-offs, spurred bird breathing system
...that low oxygen and repeated short but substantial temperature
increases because of greenhouse warming sparked two major mass-extinction events, one of which eradicated 90 percent of all species on Earth. In addition, Peter Ward, a UW professor of biology and Earth and space sciences, believes the conditions sp...
Pack rat middens give unique view on evolution and climate change in past million years
...the cave has been nicely preserved at a controlled temperature
and humidity, like putting the stuff in a refrigerator for 750,000 years," said Tony Barnosky, a University of California, Berkeley, paleobiologist. He and his former graduate student Chris J. Bell, now associate professor of geological sciences at t...
UGA researchers track greenhouse gases in forests
... the heat radiating from the earth causing the air temperature
to rise. In a nutshell, that's the "greenhouse effect" involved in global warming. Plants take in carbon dioxide, a key greenhouse gas. They use the carbon in the CO2 molecules as building blocks in their growth. Over countless years, vast amounts of...
How many fish in the sea? Census of Marine Life launches first report
...state," he said. "Increases in toxic compounds and temperature
in the sea are occurring globally with consequence...as more complete observations of such variables as temperature
and currents than most other marine ecosystems; Salmon and other Coastal Migrants (project POST) A...
Multiphoton microscope observes cell membrane action
... assortment of exotic shapes and structures as the temperature
was changed, processes that appear to involve the disappearance of boundary-line tension as the two phases merge into a single one at higher temperatures. The study was supported, in part, by a National Institutes of Health grant to the Developmenta...
Pushing marine fish aquaculture forward
...ing costs at aquaculture facilities. Manipulating temperature
during spawning to produce all female offspring for fish such as southern flounder whose females grow faster and reach sizes two to three times larger than males, and are therefore far more commercially valuable. Methods for inducing fish to spawn s...
Antarctic penguins thrive in ocean 'oases'
...R) provided weekly measurements of chlorophyll and temperature
that were used in a computer model to estimate phytoplankton productivity. The researchers found, taken together, the Ross Sea, Ronne Ice Shelf, Prydz Bay, and Amundsen Sea polynyas were responsible for more than 75 percent of total plankton producti...
COX-2 inhibitors and renal damage in obesity-related Type II diabetes
... were housed in separate cages and maintained in a temperature
and light-controlled room. Throughout the experimental period, animals had access to standard chow and drinking water. Blood pressure was measured in the conscious state utilizing the radiotelemetry method. Blood glucose levels and body weight were m...
Envisat observes resurgent ozone hole
...logical conditions there prevent the stratospheric temperature
dropping enough to cause thinning on an Antarctic scale. The small size of the 2002 Antarctic ozone hole was due to the same reason unusual wind patterns and warm weather prevented more ice cloud formation. But this year's measurements show there is...
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